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Diffusivity of dextran molecules within PEG hydrogels as a function of (a) their intrinsic permeability, or (b) compared to the predicted values using the mesh size or the square of the intrinsic permeability as the size of the transport paths. In (a) the dashed lines represent the fit described in-text. In (b) the star symbols indicate the samples for which the intrinsic permeability was overestimated. Values reported as mean ± standard deviation.
